Later in the 1940s the US realised the concept delta and massive tail concept didn't work very well. It eventually turned into the XF-92, which still wasn't particularly impressive.
When Convair started working on its first delta concepts, they found that the Lippisch thick delta wing wasn't actually very good, from either a drag or stability standpoint (Later well proven by the Gloster Javelin). They developed their own concept, based on their own studies and the work of Gluhareff at Vought-Sikorsky.
When Convair started working on its first delta concepts, they found that the Lippisch thick delta wing wasn't actually very good, from either a drag or stability standpoint (Later well proven by the Gloster Javelin).
What does Gloster Javelin had to do with Lippisch?
Lippisch' main claim to fame - Me 163 - was the fastest aircraft in service in ww2, and docile to fly, by what time Convair was happy if their designs were making 350 mph.